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The Message UI framework provides specialized view controllers for presenting standard composition interfaces for email and SMS (Short Messaging Service) text messages. Use these interfaces to add message delivery capabilities without requiring the user to leave your app.
Firebase Cloud Messaging (FCM) is a cross-platform messaging solution that lets you reliably send messages at no cost. Using FCM, you can notify a client app that new email or other data is available to sync. You can send notification messages to drive user re-engagement and retention.
The FBSDKMessengerSharer is used to share media from apps into Messenger. The underlying mechanism used to share data between apps is UIPasteboard
The Official iOS SDK of WeChat from Tencent.
OneSignal is a multi-platform push notification service and it is totally FREE to use. ... Multi-platform support: provides a single UI and API to deliver messages across various platforms such as iOS, Android, Amazon Fire, Windows Phone, Chrome Apps, and so on.